# nixos-config - My current NixOS configuration
#
# Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
# SPDX-License-Identifier: GPL-3.0-or-later
#
# This file is part of my nixos-config.
#
# You should have received a copy of the License along with this program.
# If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
{
  config,
  lib,
  pkgs,
  ...
}: let
  cfg = config.soispha.programs.fish;

  sourceFile = path: "source ${path}\n";

  extraFiles = builtins.concatStringsSep "\n" (
    builtins.map (value:
      if builtins.isPath value
      then (sourceFile value)
      else value) (
      builtins.attrValues cfg.integrations
    )
  );

  keymappings_raw = import ./keymappings.nix {inherit lib;};
  mkBinding = mode: base_key: binding: let
    sets_mode_to =
      if binding ? sets_mode_to
      then "--sets-mode ${binding.sets_mode_to} "
      else "";
  in
    if binding ? cmd
    then let
      mkCmd = cmd: "'${cmd}'";
      escaped_key =
        if base_key == ""
        then ''""''
        else
          lib.escape [
            "\""
            "("
            ")"
            "$"
            ";"
            "*"
            "&"
            "|"
            "~"
            "<"
            ">"
            "^"
            "#"
          ]
          base_key;
      escaped_cmd =
        if builtins.isList binding.cmd
        then builtins.concatStringsSep " " (builtins.map mkCmd binding.cmd)
        else mkCmd binding.cmd;
    in ''
      bind --mode "${mode}" ${sets_mode_to}--preset ${escaped_key} ${escaped_cmd}
    ''
    else
      builtins.concatStringsSep "" (lib.mapAttrsToList
        (new_key: value: mkBinding mode "${base_key + "," + new_key}" value)
        binding);
  mkMode = mode: attr: builtins.concatStringsSep "" (lib.mapAttrsToList (mkBinding mode) attr);
  keymappings =
    ''
      function fish_my_key_bindings
        fish_vi_key_bindings
        bind --erase --all --preset
    ''
    + builtins.concatStringsSep "\n" (lib.mapAttrsToList mkMode keymappings_raw)
    + ''
      end
      set -g fish_key_bindings fish_my_key_bindings
    '';
in {
  options.soispha.programs.fish = {
    enable = lib.mkEnableOption "fish";

    integrations = lib.mkOption {
      type = lib.types.attrsOf (lib.types.either lib.types.path lib.types.str);
      example = ''
        {
          atuin = ./integrations/atuin.fish;
        }
      '';
      default = {};
    };
  };

  config = lib.mkIf cfg.enable {
    # Ensure that the default shell of the user is actually enabled.
    programs.fish = {
      enable = true;
      package = pkgs.fish-patched;
    };

    users.users.soispha.shell = config.programs.fish.package;

    home-manager.users.soispha = {
      home.sessionPath = lib.mkForce [];

      programs.fish = {
        enable = true;

        package = config.programs.fish.package;

        interactiveShellInit = let
          start = lib.modules.mkBefore (
            sourceFile ./config/01_show-task.fish
          );
          end = lib.modules.mkAfter keymappings;
        in
          lib.modules.mkMerge
          [
            start

            extraFiles

            end
          ];
      };
    };
  };
}